Diesel sound with a 350
#1
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Location: Fishersville Va.
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Diesel sound with a 350
Hi my name is Tyler, i drive a 1988 K2500 P/U. I've got a 5.7L 350 i just bought as a crate motor last year. it came stock as a Throttle Body Injection (TBI) i just recently Carburated it with an Edlebrock 750. after tearing the heads off of it and cleaning em up. i just got it running the again yesterday and after getting everything figured out, it knocks when the motor is under touqe or when i just punch the throttle from idle in short burst, and also around 2500 to 3500 rpm. its not exactly a knock it sounds like a diesel, when it makes this noise. its not timed perfect but its as close as i can get it by ear with out a timing light because of the MSD Distributor. any idea on what it could be would be greatly appreciated.
#2
Welcome to the forum. Are you talking about spark knock? The list of suspects include too much ignition advance (knock sensor inoperative?), too high a cylinder compression ratio, low octane fuel, etc.
#4
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Hmmm, I drove a 454 one time where it sounded similar. Apparently the sound was that of the fuel injection system. It would only do that under load and it sounded like a diesel rattle but it was the fuel injectors making all that noise. I dont know if it is bad or not.
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thanks
Thanks therewolf I didn't know what to do. It was the timing to advance I finally broke down and invested in a timing light, thanks every one
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